Maybe you are a 40G purchasing manager, who are looking for high quality 40G, and Kewei fiber are a professional manufacturer & supplier that can meet your needs. Not only 40G we produced have certificated the international industry standard, but we can also meet your customization needs. We provide online, timely service and you can get professional guidance on 40G. Don't hesitate to get in touch with us if you are interested in 40G, we won't let you down.